Mil-PRF-131 Class 1

What is Mil-PRF-131L Class 1?

Mil-PRF-131 Class 1 material is a water-vapor-proof, foil laminate barrier material and a pinnacle in protective barrier solutions. It is military-grade and must meet certain specifications for use by all departments and agencies of the Department of Defense. Due to these specifications, these protective barriers offer the highest standards of protection and traceability. 3D Barrier Bags Inc. has three materials approved by the US Naval Labs Qualified Products Database (QPD) for Mil-PRF-131L Class 1.

As of April 2022, the specification has been updated to Mil-PRF-131L Class 1. All below qualifications are the same as Mil-PRF-131K Class 1. However, US Naval Labs QPD updated the spec due to removing the Class 2 material.

These materials can be converted into customized barrier bags to fit your products perfectly and efficiently. We can also supply rolls for small and odd jobs. Due to the inner layer of Polyethylene, the material can seal to itself with a simple handheld heat sealer, ideally with a straight bar sealer providing heat from the top and bottom simultaneously. This allows the material to be converted into custom Vapor Barrier bags, including the Mil DTL-117 spec.

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Performance Specifications for Mil-PRF-131

What makes Mil-PRF-131 materials the ultimate solution for the protection of your products? These materials display a high tear and puncture resistance and incredible barrier properties. Because of this, Mil-PRF-131L materials are ideal for large objects in need of protection from corrosion, moisture vapor damage, oxidization and outside contamination either during shipment or storage.

Mil-PRF-131 materials must undergo rigorous testing for them to be registered with the US Naval Labs Qualified Products Database (QPD). All testing specifications must be identical to the end product to ensure that there have been no unapproved changes made that could potentially damage your products. If the end material is not identical to the tested material, it could also result in the material being rejected and removed from the US Naval Labs Qualified Products Database. All testing methods must be tested with an atmosphere having a relative humidity of 50 plus/minus 5% and a temperature from 73 plus/minus 3 ℉.

For Mil-PRF-131 materials to be approved for military specifications, the material must pass rigorous testing of the following :

Seam Strength and Fabrication

1) No separation or leakage at double seam junction for testing temps of 100℉ and 160℉
2) No separation or leakage at double seam junction when sealed before aging at 160℉ (same test conditions as above)
3) No separation or leakage at double seam junction when sealed after aging at 160℉ (same test conditions as above)

Water Vapor Transmission Rate (WVTR)

1) After room temperature flexing
a) As received (gms/100 sq in/24 hrs) – .02 (max)
b) After room temperature flexing aged (gms/100 sq in/24 hrs) – .02 (max)

2) WVTR after low-temperature flexing
c) As received (gms/100 sq in/24 hrs) – .03 (max)

3) Modulated Infrared Sensor
d) As received (gms/100 sq in/24 hrs) – .0005 (max)

Breaking Strength

1) As received (weakest direction) (lb/in) – 50 minutes
2) After ageing (weakest direction) (lb/in) – 50 minutes

Puncture, Blocking and Curl Resistance

1) Puncture resistance (lbs) – 15 minutes
2) Block resistance – No blocking, delamination or rupture
3) Curl Resistance

Contact Corrosivity

1) No corrosion, etching or pitting

Delamination (Oil Resistance)

1) No leakage, swelling, delamination or embrittlement

Water Resistance

1) No delamination

If all of these tests are not passed, the material will not be approved for the US Naval Labs Qualified Products Database.

Mil-PRF-131 Requirements

After the above testing has been approved for Mil-PRF-131 use, it must still meet further requirements. From the printed text’s color to how the material is used (either in roll or bag form), all requirements must be filled for this material to meet the Military’s specifications.

Mil-PRF-131 Class 1 materials must include the following printed in a lusterless red:

Material Code
Manufacturer
Batch Number
Lot Number
Nomenclature
Moisture Transmission Rate
Sealing Guidelines

Having all of this information is extremely important because it helps with traceability. Since all bags must have a date of manufacture, lot number and job number assigned to them, we can trace the material back to not only the manufacturer but also the operator, laminate batch and components of the laminate. With all of this information available at all times, you are assured that your product will always be protected to the highest standards.

Construction Specification

Materials could also be supplied in either rolls or flat cut sheets, whichever the contract or purchase order requires. If rolls are being supplied, it should not contain more than three splices (four pieces) and each piece should not be less than 45 yards in length. Flat-cut sheets, on the other hand, will be specified by the procuring activity.

Barrier materials should be capable of being heat-sealed at 500℉ or less and should exhibit no delamination at the heat-sealed areas (seams) when sealed under the manufacturer’s recommendations. This will ensure the seals will be secure to protect your products from any moisture vapor. Mil-PRF-131 materials must also be free from any foreign matter, holes, tears, cuts, sharp creases, wrinkles or other imperfections, ensuring the highest workmanship standards.

What is Mil-DTL-117?

Mil-DTL-117 was created in 2001 and has therefore superseded the previous Mil-B-117 bags. It is the specification the government uses when it determines that an item it needs must be shipped to them in a bag form. These bags must be water vapor proof, greaseproof, flexible and heat-sealable.

Mil-DTL-117 bags are designed to keep water vapor out and moisture out to help protect your heavy-duty valuables from corrosion damage. Mil-DTL-117 bags are manufactured with specific needs as well, they must be stamped with an arrow pointing to the open end, the material type, manufacturer and date.

Specifications and Requirements for Mil-DTL-117

What sets Mil-DTL-117 bags apart from other corrosion protection bags? These bags are set to the highest military-grade standards when it comes to their specifications and construction.

An important thing to consider is the style of the bag:

“Construction. Class B, C and E bags shall be formed using two sheets or by folding one sheet of material. Heat-sealable surfaces of the specified material shall be placed face to face, heat-sealing along both sides and the bottom edge as required. Transparent bags fabricated by the side weld process shall be folded and have two side seams. The side seams shall be parallel to each other and the outer edges of the bag in all cases. The bottom fold shall be at right angles to the side seams. Class F and H bags shall be formed from one folded sheet of material and heat-sealed only along both sides. Bags fabricated from tubing shall have a bottom seam and do not require a lip.”
-Detail Specification Bags, Heat-Sealable

Each Mil-DTL-117 bag must be marked or printed in capital letters or numbers using a 10-point type and must contain:

1) The specification number & revision letter type
2) Class & Style
3) Bag’s manufacturer and bag designation
4) Month and year of the bag’s fabrication

If the markings above are interrupted or incomplete (due to the bag’s size), the individual bag does not need to be marked as specified. However, it should be accompanied by the shipping container by an identification sheet marked or printed with the same info. As always, Mil-DTL-117 bags should be free from any foreign matter, pinholes, tears, cuts, splits, slits, creases, wrinkled or other imperfections, ensuring the best quality products.

3D Barrier Bags Inc. and Mil-PRF-131 Class 1

For the past 33 years, 3D Barrier Bags has been leading the way for protective packaging against corrosion damage in many sectors, including aerospace and defense. We work with you and your team to deliver the best quality products to the highest standards. Contact us today to see how we can help you protect your products during shipment and storage.

Case Studies

Helicopters

In 2017, when a military program was discontinued, our client still needed protection from corrosion, moisture vapor damage, oxidization and outside contamination for their helicopters and wanted to continue with our services. Our team worked closely with them during their packing process to help facilitate the appropriate design to pack and protect their helicopters. Once we were able to narrow down the proper material to use and the appropriate size, a sample bag was sent to the customer for trial. We continue to provide to them to this day.

In addition to the bags, we have also supplied them with a range of consumables, including :

Desiccant to adsorb the residual humidity inside the bag and maintain the humidity level under the corrosion start point;
Shockwatches® and Tiltwatches® to allow the customer to monitor proper handling of the equipment during delivery;
Cushioning to be placed between the journals and fuselage;
Aluminum tape to cover any small holes made by the customer in case they needed to nail across the foil when installing their journals or supporting wood pieces.

Missile Docking Units

When we were approached to protect missile docking units for military combat aircraft, we needed to factor in that components came from four different countries. Our team worked hand-in-hand with the procurement company to ensure that all parts would arrive protected from the manufacturers, no matter where they were shipped from or for how long they were stored.

Our team was tasked with manufacturing customized barrier foil bags to fit on strategically placed supporting blocks within crates. However, due to the nature of military standards required, our material was written into their specification and added to the approved material base. We have since formed a relationship with the procurement company for fulfillment of their current projects, as well as custom barrier foils for storage and housing of other military components.

What Can 3D Barrier Bags Inc. Do For You?

3D Barrier Bags is an ISO 9001:2015 manufacturer, located in Orlando, Florida. We specialize in custom-fit, high-barrier bags and liners. The three Mil-PRF-131 Class 1 materials that we offer have all been tested, passed and placed on the QPD by the only test house in the world that is allowed to do so. Due to this, please be aware of counterfeit materials in the marketplace.

Our custom-made vapor barrier bags and liners provide total protection for any product susceptible to corrosion during storage or transportation. Our packaging passes all tests and specifications above, so you know that you are not only getting high-quality protection but also peace of mind that your products will arrive the exact way that you sent them. Our team will work with you every step of the way to make sure that your products are covered, no matter the size or shape.

3D Barrier Bags Inc. can construct bags as well as produce continuous tubing on a roll that adheres to these requirements, all within the guidelines for style, seals, tolerances and workmanship. Continuous tubing or rolls of tubing is a long bag with two open ends. This allows you to cut the bags to any length required when you need it. This solution is particularly effective when packaging many different items in a range of sizes. Tubing can be made in either lay flat or gusseted formats. This tubing can be manufactured from Mil-PRF-131 class 1 laminates, anti-static foil laminates or commercial grade foil laminates depending on the application.

3D Barrier Bags is an essential business, proudly serving critical packaging to pharmaceutical, medical, diagnostic and food sectors industries. 3D Barrier Bags Inc is located in Orlando, Florida and our products are proudly manufactured in the USA. We remain open and fully active during the Coronavirus Pandemic.

Corrosion Prevention Packaging

Dry Product Protection